Siiri Saimi Angerkoski (21 August 1902 – 28 March 1971) was a Finnish actress best known for her role as Justiina Puupää in Pekka & Pätkä.
Angerkoski's family moved a lot.
She was born in Oulu, but her sister Inez was born in Turku (in 1905) and her another sister Irja Inkeri was born in Maaria in 1907.
Their parents got married on 2 February 1902.
She started her career in 1933 as Marina in the film Pikku myyjätär.